Paint sprayer



April 30, 1929. D. .1. SULLIVAN PAINT SPRAYER Filed Dec. (3, 1925 H v n.

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INVENTOR Suflbvm 11. aazzm A TTORNE Y Patented Apr. 30, 1929.

DANIEL'J. SULLIVAN, F CHARLESTON, WEST VIRGINIA.

PAINT SPRAYER.

Application filed December a, 1925. Serial Kareem.

My invention relates to paint Sprayers, and the object of the invention is to provide an inexpensive, simple, and easily handled hand sprayer having facility for self cleaning.

I attain these objects and other advan' tages by means of the mechanism illustrated in the accompanying drawing in which" Figure 1 is a sectional view of a paint sprayer embodying my invention; Figure 2 is a plan view of the discharge end of the device; Figure 3 is a rearward end view of the nozzle or sprayer member of the device and, Figure 4 is a view of the forward end of the same.

Similar numerals of reference refer to corresponding parts throughout the several views.

Referring to the drawings-the numeral 1 designates a metal block casting forming the body of the device and which is invested in its upper portion with a. longitudinal bore 2 extending r'earwardly from its forward end. A plug 3 having a hole a longitudinally therethrough at its axis is fitted securely into the bore 2 in such a manner that its inner end shall be spaced apart from the inner end of the bore and its outer end portion shall extend a little distance outwardly of the forward end of the block. The outer end of the plug is provided with an annular flange 5. The outer end of the plug is provided concentrically with an annular recess 6 and a plurality of holes 7 of small diameter are apertured longitudinally through the plug and open in said recess (3,

the holes being located at diametrically opposite points. A union coupling 8 mounted onthe outer end of the plug and is provided with an interior annular flange 9 to engage the flange on the plug, the coupling having internal screw threads adapted to receive the threaded end of a nozzle member 10. The block is also provided with a longitudinal bore 11 in its lower portion and which extends in a plane parallel to the plane of the bore 2. An inlet port 12 is arranged in the body at the inner end of the bore 11 and communicates with an inlet 13 connected to a pipe 14 which is adapted to connect with a source of liquid paint under pressure, not shown. The port 12 is provided with a valve seat 15 adapted for seating a valve 16 having a stem 17 which is extended rearwardly of the block a little distance. A tension spring .18 is mounted on the stem oft-he valve within the bore 11 and its inner end presses ona spring support 19 on the stem and its outerxend presses on the inner side of a screw cap .20 which is mounted on the screw end: ofa prO ecting portion of the block to close the mouth of the bore 11. Agvertical bore 21 is provided in the upper portion of the rearward end of the block and an inlet is provided in the wall of the bore and adapted to. receive thescrew end of an air pipe 23 which is adapted to connect with a source of compressed air, not shown. A hole 24: 1s apertured downward through the block from the center of theinnerendof the bore 21 to the bore 11 and the upper end of the hole is fashioned to form a valve seat 25. A hole 26 is apertured in theblock from the center of the inner end of the bore 2 to the hole 24. A hole 27 is apertured through the block from intermediate the bore 11 and intermediate the length of the valve 16 in normal closed position to and through the plugBto the hole 4 in the plug. The hole 27 is preferably in an upward direction at an angle,las shown in Figure 1. A valve 28 is seated on the seat and, is provided. with a downwardly extending stem 29 which is loosely positioned in the hole 24 and projects a little distance into the bore 11 at the rearward end of the valve 16 and positioned to be engaged by the.

valve on its backward stroke. The rearward end of the valve 16 istapered and adapted to engage the stem 29 and force the same upward to thereby lift the valve28 when the valve 16 is pulled back, as is shown in Figure 1. Thevalve 28 is also provided with an upwardly"extendin stemj30 upon which is mounted a tension spring 31, the

lower end of which presses down on the valve to hold it to its seat and its upper end presses on the inner side of a screw plug 32 which is secured in theupper end of the bore 21. A hand grip 33 is slidably mountedonthe pipes 14 and 23 and is held to place thereon by screw nuts 34 and 35 screwed on the pipes. The nuts 35 are provided with nipples 36 having screw threads adapted for connectionuwith supply lines of pipes. A handle 37 consisting of a sleeve 38 is secured on the projecting end of the valve stem 17 by a cotter pin 39 and has a transverse finger grip 4,0 and a screw threaded extension 41 carrying an adjusting nut 42 to limit the backward stroke of the valve 16..

The nozzle is provided at its inner end with a head 43 having centrally therethrough a hole 4A which registers with the hole l in the plug and with a plurality of small holes 45 located circumterentially of the head and registering with the recess 6 in the outer end of the plug. Integral with, thehead is a discharge chamber at which is formed circular at the head and then con verging forwardly to form a narrow fair shaped outlet 47 adapted for a spreader.

The paint sprayer constructed in accord ance with my invention provides a light, durable and readily handled and operated tool which may be manipulated by the one hand, leaving the other hand free to manipulate the supply pipes and to steady and support the operator. To operate tl sprayer the hand grip 33 is taken into the hand and the first and second fingers of the hand are positioned on the transverse finger i The valves 16 and 25 are normally stated by virtue of the reaction of the tension springs 18 and 31. When liquid paint is to be sprayed the valve 16 is pulled bae against the tension of thespring 18 and, as the valve moves upon its back stroke, it first opens the inlet port 12 to the liquid paint from the pipe 14 and then the taper portion at the rear of the valve engages the end of the stem 29 and lifts the valve 25 open to the air from the pipe 23 against the tension of the spring 31 and, at the same time, the tapering forward end portion of the valve opens'the duct 27 to conln'iunication with the forward end portion of the bore 11. In this position of the valve the air flows from the pipe 523 through the bore 21, the duct 24, the hole 26, bore 2, duct 41- and perforations 7, and the holes 44; and perforations in the nozzle mei'nber and discharges at the mouth 47 at the end of the nozzle, the liquid paint flowing from the pipe 14 through inlet 13, port 12, bore 11 forwardly of the valve, duct 27', to the duct 4: and there mixing with the air and passing therewith out of the nozzle. To cut oil the flow of air and liquid paint the handle 37 is released, whereupon, the reac 'tion of the springs 18 and 31 will force the respective valves to their If it is desired to blow-out and clean the sprayer after its use, the supply of liquid paint is disconnected from the pipe 14 and the valve 16 pulled back, whereupon, the valve 25 and duct 27 will be opened and the air permitted to flow through the ducts and perforations as before explained and also flow through the duct 27, the forward end of the bore 11,

port 12, inlet 13, and pipe 14, thus blowing out and cleaning the valves, ducts, pipes and nozzle. When the liquid paint flows into the duct 27, it mixes with the air passing therethrough from the inlet 21, the mix thereafter passing through the hole lel and discharging from the fan-shaped mouth 47 of the nozzle in a spray. At the same time the air passes through the passages 7 in the cylinder and the perforations 45 in. the base of the nozzle and mixing with the mixture in the chamber 46, thus effecting a perfect mixture. The

duet in said member, an. air supplying in let in said body and communicating with the axial duct in said member, a vertical valve in said body and normally closing said air inlet and having a stem extending downwardly into the body, a horizontal valve in said body and normally closing said paint supplying inlet duct and having an elongated body portion terminating in a tapered end portion adapted to liftingly engage the stem of said vertical valve and thereby open said air supplying inlet, and a nozzle adjustably supported by said conduit member and having a head provided with a central opening registering in close relation with the axial duct in the member for the passage of paint and air into the nozzle.

2. A paint sprayer, comprising a body portion, a conduit member removably extending into said body and having an axial duct common to air and paint and a lateral extending duct to]: paint connnunicating therewith and provided in its outer end face Ill) with a concentric annular channel and with i diametrically opposite air venting perfora tions extending through the member and opening in the channel, a paint supplying inlet duct in said body and communicating with the lateral duct in said member, an a r supplying inlet in said body and communicating with the inner ends of the axial duct and the air venting perforations in said member, a vertical valve in said body and normally closing said air inlet and having a stem extending downwardly into the body, a horizontal valve in said body and normally closing said paint supplying inlet duct and having an elongated body portion terminating in a tapered end portion adapted to littingly engage the stem of said vertical valve to thereby open said air supplying inlet, and a nozzle adjustably supported by said conduit member and having a head proviilecl with a central opening registering in close relation with the axial duet in the member and with an annular series of perforated apertures communicating with the annular channel 111 the member, said axial opening being adapted for the passage of air and paint into the nozzle to mix with air passing therein through the series of 10 perforations from the channel in the endof the member.

Charleston, West Va., August 22nd, 1925. DANIEL J. SULLIVAN. 

